Rev 3078 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2613 | jermar | 1 | # |
| 2 | # Copyright (c) 2007 Jakub Jermar |
||
| 3 | # All rights reserved. |
||
| 4 | # |
||
| 5 | # Redistribution and use in source and binary forms, with or without |
||
| 6 | # modification, are permitted provided that the following conditions |
||
| 7 | # are met: |
||
| 8 | # |
||
| 9 | # - Redistributions of source code must retain the above copyright |
||
| 10 | # notice, this list of conditions and the following disclaimer. |
||
| 11 | # - Redistributions in binary form must reproduce the above copyright |
||
| 12 | # notice, this list of conditions and the following disclaimer in the |
||
| 13 | # documentation and/or other materials provided with the distribution. |
||
| 14 | # - The name of the author may not be used to endorse or promote products |
||
| 15 | # derived from this software without specific prior written permission. |
||
| 16 | # |
||
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | # |
||
| 28 | |||
| 29 | .text |
||
| 30 | |||
| 31 | /** Syscall wrapper. |
||
| 32 | * |
||
| 33 | * Mind the order of arguments. First two arguments and the syscall number go to |
||
| 34 | * scratch registers. An optimized version of this wrapper for fewer arguments |
||
| 35 | * could benefit from this and not save unused registers on the stack. |
||
| 36 | */ |
||
| 37 | .global __syscall |
||
| 38 | __syscall: |
||
| 39 | pushl %ebx |
||
| 40 | pushl %esi |
||
| 41 | pushl %edi |
||
| 42 | pushl %ebp |
||
| 43 | movl 20(%esp), %edx # First argument. |
||
| 44 | movl 24(%esp), %ecx # Second argument. |
||
| 45 | movl 28(%esp), %ebx # Third argument. |
||
| 46 | movl 32(%esp), %esi # Fourth argument. |
||
| 47 | movl 36(%esp), %edi # Fifth argument. |
||
| 48 | movl 40(%esp), %ebp # Sixth argument. |
||
| 49 | movl 44(%esp), %eax # Syscall number. |
||
| 50 | int $0x30 |
||
| 51 | popl %ebp |
||
| 52 | popl %edi |
||
| 53 | popl %esi |
||
| 54 | popl %ebx |
||
| 55 | ret |